Artesis AMT Toolkit - Page 77

Appendices
75
VOLTAGE MEASUREMENT
Voltage transformers must meet local standards and regulations. For North America,
current and voltage transformers must be certified by an OSHA appointed NRTL to
appropriate UL or CSA - product safety standards. Only SELV voltage transformers
must be used with AMU units.
Over Voltage Category
CAT II
Impedance
3.5MOhm/Phase-to-Phase
Quantity
Nominal
Minimum
Maximum
Measurable
Maximum
Permissible
Units
Voltage
480/277
20
520/300
606/350
VAC
Frequency
50/60
25
90
90
Hz
CURRENT MEASUREMENT
Current transformer and current sensors must meet local standards and regulations.
For North America, current and voltage transformers must be certified by an OSHA
appointed NRTL to appropriate UL or CSA - product safety standards.
Max. 250VAC, CAT II for 5A and 1A units.
Over Voltage
Category
CAT II
Quantity
Nominal
Minimum
Maximum
Measurable
Maximum
Permissible
Units
Impedance
(Approx.)
Current
5
0.2
7
20
(For 5 s)
A
15.3 mOhm
1
0.04
1.4
4
(For 5 s)
A
50 mOhm